Electric generator or motor.



W. RODGERS ELECTRIC GENERATOR OR MOTOR.

urLIoATIou FILED SEPT-.13, 1913.

1,093,650. Patented Apr. 21,191

UNITED STATES PATENT OFFICE.

WILLIAM RODGERS, OF HAMILTON, ONTARIO, CANADA.

ELECTRIC GENERATOR OR MOTOR.

To all whom it may concern Be it known that I, WILLIAM RODGERS, asubject of the King of Great Britain, and residing at Hamilton, in thecounty of Ventworth and Province of Ontario, Canada, have invented newand useful Improvements in Electric Generators or Motors, of which thefollowing is a specification.

My invention relates to improvements in electric generators or motorsand specially consists of a number of bent dove-tail. plates, preferablyof. steel, rigidly secured in divisioned transverse order to the innerpart of the circular cast iron stationary frame.

The objects of my invention are, first, to provide independent dovetailplates made of wrought iron or steel secured to the frame, therebyeliminating the machining out of dovetail slots in the blank casting, orframe; second; in the introduction and use of my dovetail-plate morespace for ventilation and clearance for bolts is obtained when usingcertain end plates on split frames of electrical machines; third, by theuse of my dovetaiLplates, they may be made in different standard lengthsand placed in stock ready for assembling; fourth; to provide a framebored out to a given dimension with screw holes drilled therein readyprepared to receive my dovetail-plates, of required dimension. therebyconsiderably reducing the time and cost of building the frame.

Further, in this invention, the dovetailplates can be made far inadvance of the frame casting, for assembling and other purposes.

Further, this invention provides against delay in constructing andmachining out dovetails in the solid frame, especially so should blowholes be encountered in the frame casting, this would necessitateanother casting, the advantages of my inven tion will therefore bereadily perceived.

I obtain these objects by the mechanism illustrated in the accompanyingdrawing, in which Figure 1 is an elevation of an electric machine,generator or motor partially in section, showing my method ofconstruction and design of five of my dovetail-plates secured inposition to the machine and rigid therewith, together with a. segmentportion of the iron laminated punchings in four of said dovetails. Fig.2 is an end elevation of the same, partly in section, showing positionof the dovetail-plates secured to the frame Specification of LettersPatent.

Application filed September 13, 1913.

Patented Apr. 21, 1914.

Serial No. 789,682.

plate secured to the frame of the machine by I means of a counter-sunkhead machine screw.

Similar characters of reference refer to similar parts throughout theseveral views.

In the drawing 2, is the cast iron stationary frame of an electricgenerator, or motor, and has a plurality of equally spaced seatingsaround the inner circumference or bore part of the frame; therebyforming equally spaced air recesses 4:, between said seatings.

5, are the dovetail-plates bent out of wrought iron or steel and thebase parts of said plates are secured on the seatings 3 of the bore. Thedovetail plates 5, have counter-sunk holes 6, through the base portionsthereof, as seen in Figs. 3 and 4: of the drawing, and said plates arerigidly secured to the bore seatings by means of the machine screws 8,which screw into the threaded holes 9 in the frame, two machine screwssecure each dovetail-plate to each seating of the frame.

It will be noticed that the base and the beveled sides of thedovetail-plates are of the same thickness of material throughout,therefore the same may be easily bent by machinery from one flat pieceof suitable metal. preferably steel plate. to the desired form ofdovetail, the Outer side following in parallel order the form of theinnerside. The countersunk heads of the screws are shown flush with theinner base parts of the dovetail openings of the plates so as not tointerfere with the punchings 10, in said dovetails, said punchings 10.are not new, they being common to this class of electric machines.

The construction shown in Fig. 4, is of light weight and durable, andthe dovetail plates can easily be removed and replaced by others.

hat I claim as my invention and desire to secure by Letters Patent, is

1. In an electric generator, or motor, a frame having an inner bore,dovetail-plates equally spaced apart on said bore and having countersunk holes therethrough threaded holes in the frame opposite to theholes in the plates, and screws provided with heads to fit the holes inthe plates to rigidly secure said plates to the frame, and to be flushwith the inner base of the dovetailplates.

2. In an electric generator or motor, a frame having an inner bore,dovetail plates spaced apart on said bore and having countersunk holesthrough the base parts thereof, threaded holes in the frame opposite tothe holes in the plates, and means in said holes to rigidly secure theplates to the frame, and to be flush with the inner base of thedovetail-plates.

3. In an electric generator or motor, a stationary frame having an innerbore with equally spaced recesses around the same, dovetail-plates,having counter-sunk holes 1 through the base parts thereof, on saidbore, threaded holes in the frame opposite to the holes in the plates,and means in said holes to rigidly secure the plates to the frame and tobe flush with the base of the inner sides of 2 the dovetail.

XVILLIAM RODGERS.

\Vitnesses WALTER Gnome PUTTIOK, JOHN H. HENDRY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

) Washington, I). C.

